.json

File Type

JavaScript Object Notation File

File Format

Standard

Usage

Runs when opened

Rank

★ ★ ★ Common

Description

Data interchange format used for representing simple data structures and objects; saved in a lightweight, text-based, human-readable format; originally based on a subset of JavaScript, but is considered a language-independent format.

JSON files are often used in Ajax Web application programming. They may also be used by other applications as an alternative to .XML files.